JPH0650698Y2 - Power atomizer safety valve structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a structure of a safety valve that is attached to a power sprayer and sprays pressurized water when abnormal pressure occurs.

(B) Conventional Technology The technology related to the safety valve of a power sprayer has been already known.

For example, Japanese Utility Model Publication No. 49-75127 and Japanese Utility Model Publication No. 59-186498.
It is as in the official gazette.

In the above-mentioned Japanese Utility Model Publication No. Sho 49-75127, there is a technology relating to a pressure regulator used in an air brake device for a vehicle, and there is a technology for opening and closing an air passage in a lower portion and an upper portion in an interlocked manner by moving a valve up and down. It is disclosed.

Further, according to FIG. 4 published in Japanese Utility Model Laid-Open No. 59-186498, when the pressure in the pressure tank 20 is below a certain level, the valve opening of the safety valve is completely closed by the ball valve. It has been done.

(C) Problems to be solved by the device However, the conventional safety valve as described above, the actual open valve 59-1864
In Japanese Patent Laid-Open No. 98, the following problems have occurred.

That is, when the power of the power sprayer is stopped in the pressurizing operation state, the valve port is completely closed by the ball valve, so the pressure remains in the pressure tank, and this residual pressure can escape in the state as it is. I couldn't do it.

Therefore, when the power sprayer is started again, it takes time to absorb the water due to this residual pressure, which gives the operator a feeling of distrust.When the operation of the power sprayer is stopped, the residual amount in the pressure tank remains. It is necessary to release the pressure.

(D) Means for Solving the Problems The object of the present invention is as described above, and the configuration for achieving the object will be described below.

In the safety valve of the power sprayer that presses the ball valve 21 against the lower valve seat 29 by the spring 24 to adjust the pressure, the valve seat
29 is vertically slidable inside a large-diameter cylinder 30c provided in the lower part of the cylindrical body 30, and penetrates a through hole 29a outside the valve hole of the valve seat 29 where the ball valve 21 is closed. 29a communicates the pressure chamber side of the valve seat 29 closed by the ball valve 21 with the drain port side, and is the position where the valve seat 29 is raised by pressure during operation of the power sprayer, and the through hole 29a has the large diameter. When the power sprayer is stopped and the pressure drops, the valve seat 29, which is closed by the ball valve 21, is closed by the spring 24.
By pressing down, the close contact state between the vent hole 29a and the closed surface 30d is released, the lower opening of the vent hole 29a is communicated with the pressure chamber, and the residual pressure in the pressure chamber is released from the vent hole 29a.

(E) Embodiment The purpose and construction of the present invention are as described above. Next, the construction of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is an overall plan view of the power sprayer, FIG. 2 is an overall side sectional view of the same, FIG. 3 is a side sectional view of the inside of the safety valve, and FIG. 4 is an enlarged sectional view of an essential part of FIG.

As shown in FIGS. 1 and 2, the driving force generated by the engine or the motor is transmitted to the driving pulley 1 via the belt.
Be transmitted to.

The crankshaft 9 supported by the case 2 reciprocates the plunger base 12 and the plunger 11 via the connecting rod 10 by the power obtained from the drive pulley 1.

Plunger base 12 and plunger 11 are connecting bolts 13
It is connected with and V is between the plunger 11 and the cylinder 14.
A packing 15 is provided to provide a sealing effect.

Due to the reciprocating motion of the plunger 11 and the backflow preventive action of the water absorption valve 18, the chemical liquid flows in from the water absorption port 6R (6L) and the pressure tank 20
Sent in.

The pressure in the pressure tank 20 is displayed by the pressure gauge 8 and can be adjusted to a pressure according to the work by rotating the pressure adjusting lever 3.

When the chemical liquid is pressed by the plunger 11, the chemical liquid or the like is pressure-fed by the pressure valve 16 and is discharged from the discharge ports 7L, 7R. 17
L and 17R are valve handles.

The valve body of the safety valve is, as shown in FIG.
And a pusher 22 and a valve seat 29 which is in contact with the lower surface of the ball valve 21.

That is, when the pressure in the pressure tank 20 exceeds a certain level, the ball valve 21 is pushed upward to form a gap between the ball valve 21 and the valve seat 29, and excess water is drained from the excess port 5a from this gap. Is done.

Usually, a hose is connected to the excess port 5a, and the excess water is fed back to a chemical tank or the like.

The pusher 22 is fixed to the lower spring receiver 23, and the pressure of the spring 24 pushes the ball valve 21 downward.

The spring 24 is supported by an upper spring receiver 26 and a lower spring receiver 23, and the pressure of the safety valve is adjusted by rotating the pressure adjusting lever 3. 25 is a fixing screw.

Since the upper portion of the pusher 22 has a smaller diameter than the valve opening at the lower portion of the ball valve 21, the pressure obtained from the back chamber 27 via the bypass passage 28 becomes smaller than the pressure at the valve opening, and the pressure in the back chamber 27 becomes smaller. The pressure of the safety valve can be adjusted by adding a small amount of pressure to the spring pressure above the pusher 22.

When the pressure is forcibly reduced, the safety valve reflex bar 4 is rotated.

Since the pusher 22 is lifted when the safety valve reflex bar 4 is rotated, the ball valve 21 does not receive the spring pressure, and the chemical liquid flows out to the surplus port 5a.

In such a construction, the safety valve of the present invention is further constructed as shown in FIGS. 3 and 4.

That is, a part of the safety valve case 5 and the cylinder 30 constitute a cylinder.

The cylindrical body 30 is provided with drainage openings 30a and 30b, and a large-diameter cylinder 30c is formed in the lower portion of the inner periphery of the cylindrical body 30.

In the attached drawings, the tube body 30 is screwed to the tube portion in the safety valve case 5 in consideration of manufacturing, but the tube body may be formed integrally with the safety valve case 5.

Below the inside of the cylindrical body 30, a cylindrical valve seat 29 is located along the large diameter cylinder 30c.

The outer circumference of the valve seat 29 is configured to have a diameter such that a gap between the valve seat 29 and the large diameter cylinder 30c below the cylinder 30 is eliminated and the valve seat 29 can slide up and down.

The upper surface of the valve seat 29 is composed of an upper surface portion having a valve opening, and is configured such that the valve opening is closed by pushing down the upper ball valve 21, and further, the upper surface of the valve opening portion is formed. One or a plurality of small-diameter punched holes 29a are formed in the outer circumference.

Below the valve seat 29 and the cylinder 30, the upper surface 33a of the mounting frame 33 of the safety valve that also serves as a passage for excess water is located, and there is a gap between the lower end of the cylinder 30 and the upper surface 33a of the mounting frame 33. The O-ring 31 is interposed in this gap to prevent water from leaking.

The height of the valve seat 29 is lower than the height from the closed surface 30d at the upper end of the large diameter cylinder 30c below the cylindrical body 30 to the upper surface 33a of the mounting frame 33.

Therefore, when the power sprayer is operating, the ball valve 21 can be pushed upward by the pressurized water in the pressure chamber, as shown in the right side of FIG.

Further, the valve seat 29 also moves upward due to the action of the liquid medicine flowing out, but the upper surface of the valve seat 29 abuts the closing surface 30d of the tubular body 30, and the through hole 29a of the valve seat 29 is located in the lower portion of the tubular body 30. It is closed by the closing surface 30d.

Therefore, when a high pressure is generated in the pressure chamber, the ball valve 21 is pushed up against the spring 24 by the high pressure,
Excess water is drained from the gap formed between the ball valve 21 and the valve opening of the valve seat 29, and it is possible to prevent the pressure chamber from having a high pressure above a certain level.

When the power sprayer is stopped, the valve seat 29 is pushed down to the upper surface 33a of the lower mounting frame 33 by the action of the ball valve 21, as shown in the left side view of FIG. The valve opening of is closed by the ball valve 21.

However, even if the valve port is closed in this way, the valve seat 29 has a small-diameter hole 29a, and the upper surface of the valve seat 29 and the mounting frame 3
There is a gap between the upper surface 33a and the upper surface 33a. Further, the hole of the through hole 29a opened on the lower surface of the valve seat 29 communicates with the pressure chamber.

For this reason, the pressure remaining in the pressure chamber is released upward through the vent hole 29a and further through the openings 30a and 30b between the ball valve 21 and the inner peripheral surface of the cylindrical body 30 to remove the residual pressure in the pressure chamber. You can let it escape.

As a result, even if the power sprayer is stopped and then restarted, the residual pressure in the pressurized state is released, so that water can be absorbed without the work of releasing the residual pressure.

(F) Effects of the Invention With the configuration of the present invention as described above, the following effects can be achieved.

Firstly, the valve seat inside the safety valve of the power sprayer is provided with the through hole 29a for allowing the residual pressure to escape, so that the safety valve reflector 4 is closed by the ball valve 21 even when the safety valve reflector 4 is in the pressurizing position during water absorption. The valve seat 29 is pushed down by the spring 24 to release the close contact between the vent hole 29a and the closing surface 30d, and the residual pressure in the pressure chamber can be released from the vent hole 29a, so that the pressure can be reduced.

Secondly, since the pressure can be reduced as described above, even when the power sprayer is restarted, the safety valve reflex 4 is operated,
It was possible to absorb water easily and in a short time without the work of releasing residual pressure.

Thirdly, the valve seat moves upward during operation to eliminate the gap between the valve seat and the cylinder, so that the chemical solution does not flow out from the through hole and acts as a normal safety valve.

[Brief description of drawings]

FIG. 1 is an overall plan view of the power sprayer, FIG. 2 is an overall side sectional view of the same, FIG. 3 is a side sectional view of the inside of the safety valve, and FIG. 4 is an enlarged sectional view of an essential part of FIG. 21 ... Ball valve 24 ... Spring 29 ... Valve seat 29a ... Exhaust hole 30 ... Cylinder 30c ... Large diameter cylinder 30d ... Closed surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masato Nagareshi, 6-6 Nishiwaka-cho, Mishima City, Shizuoka Prefecture, New Delta Industrial Co., Ltd. (56) References: Showa 49-75127 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A safety valve of a power sprayer in which a spring 24 presses a ball valve 21 against a lower valve seat 29 to adjust the pressure. In the safety valve of a power sprayer, the valve seat 29 is provided inside a large-diameter cylinder 30c. The ball valve 21 of the valve seat 29 is slidable in the vertical direction and penetrates a through hole 29a outside the valve hole of the ball valve 21 of the valve seat 29, and the through hole 29a is connected to the pressure chamber side of the valve seat 29 closed by the ball valve 21. When the power sprayer is operating, the drain port side is in communication, and at the position where the valve seat 29 rises due to pressure, the vent hole 29a
Is configured to be closed by closely adhering to the closing surface 30d provided at the upper end of the large diameter cylinder 30c, and when the power sprayer stops and the pressure drops, the valve seat 29 closed by the ball valve 21.
Is pushed down by the spring 24, and the escape hole 29a and the closing surface 3
A power sprayer safety valve structure characterized in that the contact state of 0d is released, the lower opening of the vent hole 29a is communicated with the pressure chamber, and the residual pressure in the pressure chamber is released from the vent hole 29a.